干旱区生态环境知识资源中心(Arid): 半干旱区不同下垫面大气湍流通量比较分析

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	半干旱区不同下垫面大气湍流通量比较分析
其他题名	Analysis of Turbulent Flux on Different Underlying Surfaces over Semi-arid Area
	陈丽晶; 张镭; 梁捷宁; 周旭
来源期刊	高原气象
ISSN	1000-0534
出版年	2017
卷号	36 期号:5 页码:1325-1335
中文摘要	为了更深入地认识不同条件下的陆-气相互作用,选取2007年1月至2008年12月兰州大学半干旱气候与环境观测站(Semi-Arid Climate and Environment Observatory of Lanzhou University, SACOL)与中科院吉林通榆观测站的湍流资料,并结合常规气象观测资料,利用Swinbank于1951年提出的涡动相关法分析三种下垫面上的湍流通量,从而定量地描述和认识陆-气相互作用,并比较分析半干旱区不同下垫面热通量和动量通量的日变化与季节变化特征。结果表明:(1)SACOL、草原站和农田站上感、潜热通量的日变化均表现为单峰型,其中感热通量Hs日峰值可分别达到140.3, 157.3和144.8 W·m~(-2);潜热通量LvE日峰值为Hs的40%~75%。(2)夜间热通量主要集中于-22.6~24.2 W·m~(-2),夜间Hs一年四季均表现为负值,而LvE几乎保持正值。(3)各测站上动量通量tau具有明显日变化,但由于风向、风速差异,通榆地区tau的日峰值可达0.25 kg·m~(-1)·s~(-2),而SACOL仅有0.08 kg·m~(-1)·s~(-2)。(4)通榆站上tau的日变化具有显著季节差异,春、秋季的日较差远大于其他季。(5)排除热力因子影响,黄土高原下垫面对湍流活动的削弱作用更强,在该下垫面上近地层大气更容易也更快趋于稳定。
英文摘要	In order to understand the land-atmosphere interaction between different conditions more deeply, we take eddy covariance technique proposed by Swinbank in 1951 primarily to analyse the turbulent flux which could describe the land-atmosphere interaction quantificationally on three types of underlying surfaces. We contrast the diurnal and seasonal variations of heat flux and momentum flux on loess plateau, grassland and cropland in semi-arid area by using turbulent data from January 2007 to December 2008, which comes from Semi-arid Climate and Environment Observatory of Lanzhou University (SACOL), the grassland and the cropland station in Tongyu. Combined with the conventional meteorological elements, the results show that: (1) At the SACOL, grassland station and cropland station of Tongyu, the diurnal variations of sensible and latent heat flux both show a typical "single-peak" structure. The peak value of sensible heat flux (Hs) in SACOL, grassland and cropland is 157.3 W·m~(-2), 144.8 W·m~(-2) and 140.3 W·m~(-2), which is the double of latent heat flux (LvE). (2) The heat flux mainly locate in -22.6~24.2 W·m~(-2) at night, and Hs is negative, LvE is positive. (3) The diurnal variation of the momentum flux(tau) shows the same law in the three station, the daily peak of tau in Tongyu is 0.25 kg·m~(-1)·s~(-2), which in SACOL is 0.08 kg·m~(-1)·s~(-2). (4) The diurnal variation of tau has an obvious difference in difference seasons, the daily range in spring and autumn is bigger than other seasons. (5) Except thermal factors, loess plateau has a stronger extinction effect on turbulent, atmosphere will be stable easier and quicker.
中文关键词	陆-气相互作用 ; 湍流通量 ; 涡动相关 ; 吉林通榆
英文关键词	SACOL Land-atmosphere interaction Turbulent Flux Eddy Covariance Technique SACOL Tongyu
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:6100542
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236108
作者单位	兰州大学大气科学学院, 半干旱气候变化教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	陈丽晶,张镭,梁捷宁,等. 半干旱区不同下垫面大气湍流通量比较分析[J]. 兰州大学,2017,36(5):1325-1335.
APA	陈丽晶,张镭,梁捷宁,&周旭.(2017).半干旱区不同下垫面大气湍流通量比较分析.高原气象,36(5),1325-1335.
MLA	陈丽晶,et al."半干旱区不同下垫面大气湍流通量比较分析".高原气象 36.5(2017):1325-1335.